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Raman spectrum of [Ru(CNBu t)(CO)(eta2-C6H4-2-CHO)(PPh3)2][BF4].2CDCl3 shows that the crystallographically determined bifurcated hydrogen-bonding interaction Cl3CD...F2BF2- is an example of a blue-shifting hydrogen bond
Authors:Brisdon Alan K  Flower Kevin R  Pritchard Robin G
Institution:School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
Abstract:Raman data suggest that a crystallographically determined Cl3CD...F2BF2- interaction in the solid-state structure of Ru(CNBut)(CO)(eta2-C6H4-2-CHO)(PPh3)2]BF4].2CDCl3 is an example of a blue-shifting bifurcated hydrogen bond. The nu(C-D) band blue-shifts 5 cm-1 to 2269 cm-1 compared to 2264 cm-1 for CDCl3 in the gas phase and 20 cm-1 from frozen CDCl3 at 2249 cm-1. A conventional interpretation of these band shifts would suggest that the CCl2 fragment of DCCl3 is a stronger hydrogen-bond acceptor than the BF2 fragment of a BF4- group.
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